Tap wrench



K. A.A KUHN TAP yW-UEINCI'I May 30, 1939.

Filed June 21, i937 um .uw

I .MAQ INVENTOR fwAJ/uluz A'rToRNEY5 Patented May 30, 1939 i i UNITED STATES PATENT OFFICE TAP WRENCH Karl A. Kuhn, Greenfield, Mass., assigner to Greenfield Tap and Die Corporation, Greenfield, Mass., a corporation of Massachusetts Applioatio'n June 21, 1937, serial No. 149,425

1 Claim. (ol. 141-149) This invention relates to Wrenches and parhandle 20 will have a sufficiently extensive bearticularly to an adjustable wrench for taps, ing surface against the body II to provide the reamers and the like. necessary strength to withstand the heavy A main object of the invention is to provide strains to which the device may be subjected in 5 a wrench of the indicated type that has fewer use. To increase this bearing surface the gripparts and is more co-mpact Without sacrificing ping faces I 6 may be located somewhat beyond strength. Another purpose is to provide a conthe longitudinal center of the body II.

struction that may be readily manufactured, be- To engage the shank of a tap, reainer or other ing adapted for production by an automatic matool after jaw I8 has been fully retracted, clocl l0 chine from bar steel. Wise rotation of handle 20 will force jaw I8 to- 10 Other objects and advantages will appear from Ward the gripping faces I6 to engage such shank the following description taken in connection rapidly and solidly, the double screw arrange- With the accompanying drawing, in which ment providing ready engagement and disen- Fig. 1 is a plan face view of the wrench; gagement as Well as firm gripping action. The Fig. 2 is a similar edgewise view; thickened portions of the body adjacent the in- 15 Fig. 3 isa view similar to Fig. 1 showing the tersections of faces I4 and end portions I2 overbody, jaw and associated parts in central longilie bores 2l and 26. tudinal section; The construction provides a compact, neat, Fg- 4 S a t'anSVeTSe 5601710 0n une 4 '4 of and strong body free from projections and which F1g. 1, en d provides the requisite strength at all points of F19 5 1S a transverse Sectlon on Ime 5""5 of strain. The body is suitably contoured for ready Fig. 2- manufacture from bar steel on an automatic ma- The wrench comprises an integral body I I having tapered end portions I2 and intermediate side por-tions I3 formed concentric with the lonchine, and may be made by standard processes from steel of the necessary strength and hardgitudinei exis of the body n, the end and eide ness ,Permitting the norporetion 0f integral portions preferably being formed substantially gnpplflg faces I6 @n.the body itselfonv an arc of a circle in longitudinal section as W- hlle Verleus designs and arrangements are shown in Fig 3, Opposite faces |4 intermediate possible, within. the scope of the invention as desides I3 and ends I2 include a relatively flat cenned 111 the 01211111. the preferred embodiment has 30 tral portion and outwardly curved end Zones adbeen illustrated to scale to indicate desirable jacent the end portions I2 to provide increased prOpOrOn and reletienships betWeen parts. thickness of metal at these points. I claim:

A transverse opening l5 eXtendS through the A tap wrench comprising a flat body I I of body II between faces I4 and is provided ai? One bar steel tapering to less Width toward each end with gripping faces l5 et rlghi angles t0 each end in the plane of the faces I4 and enlarged Other, With parallel Side Walls i7 SerVing 21S jeW in thickness at each end in a direction normal gndeS- JaW I3 iS Slidahly mOilned between Wells to said faces I 4 to form conical end portions I2,

IT and prOVided With a gripping fece in the form said body II having a slot I5 with jaw I6 at one Of a right angled notch I9 aligned With the 2111- end and the threaded bore 2I opening from said 40 gle between faces I6 to grip OppOSiGe angles 0f e slot at the other end, a handle 25 at one end squared shank. of said body, a jaw I8 sliding in said slot and A bar handle 20 is threaded 1n bOre 2 I 1n bOdY having a bore 24, a rotatable handle 20 threaded Il by a right hand thread, and a pin 22 1S threadinto the bore 2| in one end of seid body H and ed in bore 23 1n the end 0f handle 20 by 2 left having a threaded bore 23 Within its threaded 45 hand thread. The outer end 0f p m 22 engages end and within the bore 2| of seid body and oer- .iefW is, es by el Press t 1n e Sultable bore 24 rying an enlarged grip portion at its outer end, in Said 321W. A Cooperating Xed ba handle g5 and a pin 22 having at one end a head forceis mounted on the opposlte end 0f body Il 111 fitted into seid bore of seid jew and threaded alignment With handle 20, aS by SCreWlng the at the other end into the bore 2'3 of the rotatable 50 end of handle 25 tightly into bore 2'6 in Said handle 2o so that al1 of the threaded adjustbody. ing means are overlapped within one end of said The parts are arranged SG that a reverse I'Ota'- body II, said conical end portions I2 being of tion of handle 20 will retract the handle in bore suicient size to support the wrench in all po- 2| and simultaneously retract pin 22 in bore 23 sitions with the enlarge grip of the rotatable 55 in the handle, rapidly withdrawing the jaw I8 handle 20 entirely out of contact with a. flat supuntil it reaches the end of the opening I5, the perting Surface.

parts being proportioned so that in this position KARL A. KUHN. 

